US Open champs Medvedev, Murray win; Ukrainian stuns Halep

Daniil Medvedev had an easy start to his U.S. Open title defense, beating Stefan Kozlov 6-2, 6-4, 6-0. Simona Halep had another early exit, this time in a memorable first tour-level win for Ukrainian Daria Snigur, who upset the No. 7 seed 6-2, 0-6, 6-4. On the same Arthur Ashe Stadium court where Serena Williams is set to begin what could be the final tournament of her career, the top-seeded Medvedev looked just as strong as he did in sweeping past Novak Djokovic in last year's final for his first major title.